Ariz. Admin. Code § R18-12-242 - Release Detection for Hazardous Substance UST Systems

A. Owners and operators of hazardous substance UST systems shall provide containment that meets the following requirements and monitor these systems using R18-12-243(G) at least monthly:

B. Owners and operators of a new hazardous substance UST system shall provide release detection which meets the following requirements:

1. Secondary containment systems shall be designed, constructed, and installed to:

a. Contain regulated substances leaked from the primary containment until they are detected and removed,

b. Prevent the release of regulated substances to the environment at any time during the operational life of the UST system,

c. Be checked for evidence of a release at least monthly.

2. Double-walled tanks shall be designed, constructed, and installed to meet both of the following requirements:

a. Contain a leak from any portion of the inner tank within the outer wall,

b. Detect the failure of the inner wall.

3. External liners, including vaults, shall be designed, constructed, and installed to meet all of the following requirements:

a. Contain 100% of the capacity of the largest UST system within its boundary,

b. Prevent the interference of precipitation or groundwater intrusion with the ability to contain or detect a release of regulated substances,

c. Surround the tank completely so that it is capable of preventing lateral as well as vertical migration of regulated substances.

4. Underground piping shall be equipped with secondary containment that satisfies the requirements of this Section (e.g., trench liners, double-walled pipe). In addition, underground piping that conveys regulated substances under pressure shall be equipped with an automatic line leak detector in accordance with R18-12-244(A).

5. For hazardous substance UST systems installed on or before January 1, 2020, methods of release detection other than those described in subsections (1) through (4) may be used if owners and operators meet all of the following requirements:

a. Demonstrate to the Department that an alternate method can detect a release of the stored substance as effectively as any of the methods allowed in R18-12-243(B) through (I) can detect a release of petroleum;

b. Provide information to the Department on effective corrective action technologies, health risks, and chemical and physical properties of the stored substance, and the characteristics of the UST site;

c. Obtain approval from the Department in writing to use the alternate release detection method before the installation and operation of the UST system.

Notes

Ariz. Admin. Code § R18-12-242

Adopted effective July 30, 1996 (Supp. 96-3). Amended by final rulemaking at 25 A.A.R. 3123, effective 1/1/2020.